[OpenMP] Fix comparison to True/False in openmp/**.py (#94041)

from PEP8
(https://peps.python.org/pep-0008/#programming-recommendations):

> Comparisons to singletons like None should always be done with is or
is not, never the equality operators.

Co-authored-by: Eisuke Kawashima <e-kwsm@users.noreply.github.com>
GitOrigin-RevId: 11a9ab125737e4b43a98073ccf238cef9c8501b9
2 files changed